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Cfd extraction of heat transfer coefficient in cryogenic propellant tanks
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Yang, H. Q. West, Jeff |
| Copyright Year | 2015 |
| Description | Current reduced-order thermal model for cryogenic propellant tanks is based on correlations built for flat plates collected in the 1950's. The use of these correlations suffers from inaccurate geometry representation; inaccurate gravity orientation; ambiguous length scale; and lack of detailed validation. This study uses first-principles based CFD methodology to compute heat transfer from the tank wall to the cryogenic fluids and extracts and correlates the equivalent heat transfer coefficient to support reduced-order thermal model. The CFD tool was first validated against available experimental data and commonly used correlations for natural convection along a vertically heated wall. Good agreements between the present prediction and experimental data have been found for flows in laminar as well turbulent regimes. The convective heat transfer between the tank wall and cryogenic propellant, and that between the tank wall and ullage gas were then simulated. The results showed that the commonly used heat transfer correlations for either vertical or horizontal plate over-predict heat transfer rate for the cryogenic tank, in some cases by as much as one order of magnitude. A characteristic length scale has been defined that can correlate all heat transfer coefficients for different fill levels into a single curve. This curve can be used for the reduced-order heat transfer model analysis. |
| File Size | 1681875 |
| Page Count | 27 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_20150016496 |
| Archival Resource Key | ark:/13960/t3421zz9d |
| Language | English |
| Publisher Date | 2015-07-27 |
| Access Restriction | Open |
| Subject Keyword | Propellants And Fuels Fluid Mechanics And Thermodynamics Convective Heat Transfer Correlation Nusselt Number Flat Plates Computational Fluid Dynamics Enthalpy Cryogenic Fluids Computerized Simulation Propellant Tanks Navier-stokes Equation Continuity Equation Boussinesq Approximation Dynamic Models Extraction Ullage Computational Grids Heat Transfer Coefficients Viscous Fluids Heat Transfer Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Article |
